Thousands of Russians marched in Moscow in memory of opposition leader Boris Nemtsov, whose slaying has sent shock waves through society as the highest-profile assassination in Russia during the Putin era.

A showdown this week between the White House and Israel’s Netanyahu has far-reaching implications for ties between the two countries and the shape of power and influence in the Middle East.

+ Andrew Marella, 15, talks with his parents at…

Andrew Marella, 15, talks with his parents at the National Institutes of Health in Bethesda, Md., before getting his monthly infusion of cyclodextrin, an experimental drug being tested in a clinical trial of patients with the fatal cholesterol metabolism disorder, Niemann-Pick Type C.

Photo: Lexey Swall for The Wall Street Journal

+ Andrew Marella waits before getting an infusi…

Andrew Marella waits before getting an infusion of cyclodextrin. The dose will be twice the amount of previous infusions, as researchers seek a dosage that will stop or slow the rare genetic disease. One side effect: the higher the dose, the greater the risk of hearing loss.

Photo: Lexey Swall for The Wall Street Journal

+ Andrew Marella, right, is prepped for his cyc…

Andrew Marella, right, is prepped for his cyclodextrin infusion. Every time a dose is increased, his parents, Phil Marella, seated, and Andrea Marella, standing next to Mr. Marella, must weigh the hope the drug will extend Andrew’s life against the likely chance of hearing loss.

Photo: Lexey Swall for The Wall Street Journal

+ Andrew Marella has a hearing test administere…

Andrew Marella has a hearing test administered by Kelly King, an audiologist at the National Institutes of Health, who is monitoring the hearing of trial participants. Andrew’s mother, Andrea Marella, waits.

Photo: Lexey Swall for The Wall Street Journal

+ Andrew Marella, with his father, learned his…

Andrew Marella, with his father, learned his hearing hadn’t significantly worsened after the increased dose of cyclodextrin.

Telecom firms trying to connect billions more people to the Web aren’t sure if Facebook is their friend or foe. Tensions between the phone and Internet industries will be on display at the Mobile World Congress in Barcelona.

Abreast of the Market: Institutions are piling into exchange-traded bond funds at the fastest pace on record, driven by forces reshaping the increasingly illiquid corporate-debt market and their desire to stay nimble ahead of expected rate moves.

Hillary Clinton and her close advisers are telling Democratic donors that she will enter the presidential race sooner than expected, likely in April, a move that would allay uncertainties and allow her to rev up fundraising.

A presidential task force on policing calls for increased use of body cameras and other technology, and expanded efforts to connect officers with neighborhoods, among proposals aimed at building trust between law enforcement and communities.

Estonia’s ruling center-right Reform Party won the most votes in general elections Sunday, beating a pro-Russian party in a close fight that centered on taxes and national security amid Kremlin’s moves in Ukraine.

The Outlook: Investors are obsessing over when the Federal Reserve will start raising short-term rates. Drawing less scrutiny is where rates will end up in the long run and how they’ll get there. But it’s time to start paying attention.

Israeli Prime Minister Benjamin Netanyahu heads to the U.S. to attempt to scuttle plans for a nuclear deal with Iran, China's National People's Congress convenes in Beijing, and Barcelona hosts the world's largest annual mobile-device industry show.

In pictures selected Sunday by Wall Street Journal editors, a rally in Gaza City marks the anniversary of the founding of the Democratic Front for the Liberation of Palestine, Afghans salvage their belongings after an avalanche, and more.

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